Display device with variable capacity buffer memory

Details Display device with variable capacity buffer memory Display device with variable capacity buffer memory

1979-06-11

1982-04-13

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340748, 340790, G09G 114

Patent

active

043250637

ABSTRACT:
A display system which has a source of blocks of codes representing characters to be displayed and a display device which converts the blocks of codes to lines of visually displayed characters is provided with a buffer memory which connects the source to the display device. The buffer memory includes a random access memory (RAM) with addressed registers for storing the codes and an address generator in the form of a counter. When a block of codes is transferred from the source to the buffer memory, the counter is initialized and as each code is transmitted to the buffer memory the counter is incremented. Each time the block of codes is transferred from the buffer memory to the display device the counter is again initialized and with the reading of each code from the memory the counter is again incremented. The buffer memory includes two identical RAMs and is controlled such that while one RAM is being loaded the other RAM is being read.

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